Whole-field testing method for internal flow of drip emitter maze flow channel

Abstract

The invention discloses a whole-field testing method for the internal flow of a drip emitter maze flow channel, which belongs to the technical field of detection. Firstly, a transparent cylindrical drip emitter flow channel model and an internal flow rate testing system of the drip emitter maze flow channel are constructed, and water flow moving action is represented by the following movement of a tracer particle and a DPIV system on the basis of tracer fluorescent particles; and by a laser beam illumination flow field, a CCD camera is used for continuously shooting pictures of the flow field, and related computation is carried out on two continuous frames of particle pictures so as to obtain the characteristic parameters of the speed flow field. The invention utilizes a microscope objective to modify a conventional CCD camera so as to successfully solve the contradiction between the shooting area and the image resolution of the internal fluid flow of the critical scale of the drip emitter flow channel and successfully realize the two-dimensional whole-field and quasi-three-dimensional local undisturbed test of the internal flow field of the drip emitter flow channel. The invention has the flowing characteristics of the maze flow channel and the characteristic of being consistent with the whole-field test result display of the existing numerical simulation and water flow movement.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a full-field test method for flow in a labyrinth flow channel of a drip irrigation emitter. Background technique [0002] The structure of the emitter and its hydraulic performance have a great influence on the uniformity of irrigation, anti-clogging ability and system life of the drip irrigation system. In order to design an emitter with high anti-clogging performance, it is necessary to have a comprehensive understanding of the mechanism of fluid flow in the flow channel, so the flow analysis inside the flow channel of the emitter is carried out to realize the visualization of the fluid flow inside the flow channel. The optimal design of runners provides effective theoretical guidance and has become an important goal for emitter runner designers. Due to the narrow flow channel and complex boundary of the emitter, the prototype test is difficult in technology (con...

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Problems solved by technology

[0006] (2) The size of the labyrinth flow channel of the emitter is generally between 0.5-1.2mm, and the tip distance is usually between 3.0-5.0mm. Using the conventional DPIV system test, there will be poor image quality due to the large shooting area The result appears, which affects the accuracy of the test accuracy; when the Micro-DPIV system is used for testing, because the shooting area is too small (0.5mm×0.5mm near the tooth tip), the full-field characteristics of the runner flow cannot be displayed

[0007] (3) Due to the interference of the transparency of the model material and the change of the flatness of the material during the machining process, noise occurs during the DPIV test, which affects the measurement accuracy of the flow rate

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